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From "Rick Hillegas (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5494) Same value returned by successive calls to a sequence generator flanking an unorderly shutdown.
Date Thu, 17 Nov 2011 16:58:51 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13152138#comment-13152138
] 

Rick Hillegas commented on DERBY-5494:
--------------------------------------

Hi Kathey,

There may be a variant of this issue which affects identity columns in 10.9. There may also
be a variant of this issue which affects identity columns in 10.8, 10.7, and all the way back.
I say that because the transaction trickiness in the sequence generators was modelled on similar
trickiness in the pre-exisiting identity implementation. But I haven't investigated the implications
for identity columns yet. Hopefully the solution to this problem will address identity columns,
at least in 10.9.
                
> Same value returned by successive calls to a sequence generator flanking an unorderly
shutdown.
> -----------------------------------------------------------------------------------------------
>
>                 Key: DERBY-5494
>                 URL: https://issues.apache.org/jira/browse/DERBY-5494
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.6.1.0, 10.6.2.1, 10.7.1.1, 10.8.1.2, 10.8.2.2, 10.9.0.0
>            Reporter: Rick Hillegas
>
> The following sequence of steps causes a sequence generator to return the same value
on successive NEXT VALUE FOR calls.
> 1) Bring up ij and issue the following commands:
> connect 'jdbc:derby:db;create=true';
> create sequence s;
> values next value for s; 
> 2) Control-c out of ij so that the engine comes down hard without an orderly shutdown.
> 3) Now bring up ij again and issue the following commands:
> connect 'jdbc:derby:db';
> values next value for s; 
> Thanks to Knut for finding this one.

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